Earlier this year, both major Web engines (WebKit/Safari and Chromium/Chrome/Edge/Brave) accelerated HTML parsing using SIMD instructions. These ‘SIMD’ instructions are special instructions that are present in all our processors that can process multiple bytes at once (e.g., 16 bytes).| Daniel Lemire's blog
Modern processors have instructions to process several bytes at once. Effectively all processors have the capability of processing 16 bytes at once. These instructions are called SIMD, for single instruction, multiple data.| Daniel Lemire's blog